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Plex LXC (unprivileged) using 100% SWAP?
(i.imgur.com)
Proxmox VE is a complete, open-source server management platform for enterprise virtualization. It tightly integrates the KVM hypervisor and Linux Containers (LXC), software-defined storage and networking functionality, on a single platform. With the integrated web-based user interface you can manage VMs and containers, high availability for clusters, or the integrated disaster recovery tools with ease.
A few of my Proxmox containers do this. They all work fine, so I never questioned it. Not my Plex container though.